Drill-chuck for use on hammer rock-drills.



110,864,270. v PATENTED AUG. 27, 1907, A. L. STEPHENS &: T. MQGRATH. DRILL CHUCK FOR USE ON HAMMER ROCK DRILLS.

APPLICATION FILBD JUNE16, -1906.

WITNESSES: 73.75?

ATTORNEY.

UNITED STATES PATENT OFFICE.

ALBERT L. STEPHENS AND THOMAS MCGRATH ,OF SILVER PLUME, COLORADO, ASSIGNORS OF ONE-FOURTH TO WILLIAM C. GHAMPIONfOF SILVER PLUME, COLORADO, AND ONF- FOURTH TO PHILIP T. STEPHENS, OF

GEORGETOWN, COLORADO.

DRILL-CHUCK FOR USE HAmR'ROGK -DRILLS.

Specification of Letters Patent.

Patented Aug. 27, 1907.

A pli ation fil d June 16, 1905. senai'ragzz,ozq.

To aZl 'whom it may conc'emf Be it known that we, ALBER L. STEPHENs and THOMAS McGna'rH, citizens of the United States of 1 America, residing at Silver Plume, in the county of 5, Clear Creek and State of Colorado, have invented.

certain-newand useful Improvements in Drill-Chucks for Use on Hammer Rock-Drills, of which the follow ing is a specification.

Our invention relates to a detachable drill chuck for use on drilling machines and more particularly on the class of machines in which a hammer has a re ciprocating movement ina cylinder to impinge upon the end of the drill-bit. I Its principal object is to provide'a device adapted to detachably connect the drill-bit with the machine in operative relation to thejhammer and which'has independent means to feed water through a central bore in the bit, to thejace of the hole which is being bored in the rock.

The use of the detachable water-feeding chuck obviates the employment of separate machines for wet and dry drilling, effectively prevents the leakage of water common in the socalled water'machines, invites simplification of the machines on which it '25 is used and greatly facilitates the feeding of water of which like parts are similarly designated and in which Figure 1-represents a vertical section through the device, mounted in the hammer cylinder of adrilling machine and supporting the drill'bit, Fig. 2-a side w elevation of the .detached chuck, Fig. 3'a cross'section taken along a line 3 3, Fig. 1, Fig. 4a cross section taken along a line 44, Fig. 1, Fig. 5an enlarged cross section along a line 5 5, Fig. 1 and Fig. 6an end view of the chuck.

Referring to the drawings, 5 represents the front end of the hammer-cylinder of a hammer drilling machine, provided with. the so-called drill-thimble 6 and the hammer 5, and 7 the usually hexagonal drill-bit provided with a longitudinal bore or water passage 8, through which the water is .fed into the drill hole in the rock or stone. p

The detachable drill chuck 9 consists of a cylindrical body portion 10 having a polygonal socket 11, adapted to receive and hold the correspondingly shaped exof the bushing or thimble 6. Chuck 9 is furthermora provided with a central, longitudinal bore 13'into which is fitted a tube 14, the outer extremity '15 of which protrudes into socket 11 and forms the nozzle through which; in practice, the water isintroduced into the central bore 8 of the drill-bit. To facilitate adjustment and'renewal of the tube, the bore 13 is preferably extended throughout the stem 12 and its mouth stopped by means. of a suitable plug 16 after the tube is in its proper position. A radially extending, cylindrical passage 1'7 in the body portion 10 of the chuck, connects its circumferential surface with the longitudinal bore 13 and, in practice, communicates with a peripheral aperture. 18 in-the water-tube 13. Fitted into the mouth of passage 17 is an outwardly extending feed pipe 19, preferably bent to form an elbow and provided with a turn-valve or feed-cock 20 by means of which the flow of water is controlled. The outer extremity of pipe 19', extending beyond valve 20 connects with a flexible conduit or hose 21, which leads to a tank or other suitable water supply.

i To renderthe joint between the drill-bit and the mouth'of socket 1 1 impervious and thus prevent possible leakage, the outer extremity of the chuck is pro- 7 5 vided with an external screw thread to cooperate with the interior thread of a screw-collar or gland 22 which has a central cylindrical opening 23 through which, in'practice, the drill'bit loosely extends. An'elastic" gasket 24 and a therewith contiguous metal ring 2580 occupy'the annular space between the end surface oi the chuck and the opposite surface of gland 22, the former to secure the water-tight joint, while the ring, having a polygonal opening 26 corresponding with the exterior shape of the drill-bit, holds the'latter against rotation while the gland is being screwed onto the chuck for the purpose of compressing gasket 24. The screw collar is furthermore provided with. radially extending wings 27 to facilitate manipulation.

' Having thus described the mechanical construction of the device, its operation will be readily understood,

The reciprocating hammer ofthe machine impingesupon the extremity of stem 12 which extends within the hammer-cylinder 5 and impels the head of the drill-bit, fitted in socket 11, against the material it is desired to penetrate. 4

To prevent dust, the frequent cause of miners consumption, or to clear the hole of drillin'gs-and thereby insure immediate contact of the point or? the drilllw'ith the rock, the operator turns valve 20 and thus permits the water supplied through conduit 21, to flow through passage 17 and the therewith communicating nozzle 15, into the central bore 8 of the drill-bit,'to be expelled at its point into the drill hole.

Having thus described our invention what we claim 1. The combination with the cylinder of a drilling machine, of a socketed chuck having a longitudinal movement therein, .'1 longitudinally bored drill bit within the socket and 11v nozzle on the said chuck extending loosely into the bore. of the bit'the said chuck being provided with a pus,

sage communicating with the.-

thereto'. I

' 2. In combination, a drill chuck having a socketed body portion and, :i' therewith axially alined stem, a bore opening into its socket and a passage communicating with the nozzle for supplying fluid bore and adapted to lie connected with a water supply, a

longitudinally bored drill bit Within the socket, and a nozzle connecting the two bores 3. A drill chuck comprising in combination a body hav- 'ing. if water pnssageand'asocketed extremity, and a nozzle the said socket. o i

4. A drill chuck comprising in combination, a bodv having a socketed extremity and provided with a central bore communicating with the said passage and projecting into and a radial water passage connected therewith, 'a tube in .the bore protruding within the socket and having an aper- ,ture alined with the said water paliasage, and a valve-controlled conduit connecting withthe orifice of the said passage. I In combination, of drill chnckiheving a. socketedexiremity and a bore opening therein, a longitudinally bored 4. In combination, a socketed chuck, a longitudinally bored drill-bit within the socket, and a nozzle on the said chuck extending loosely into the bore of the bit, the said chuck being provided with a. passage communlceting with the nozzle for supplying fluid thereto.

in testimony whereof we have aifixed our signatures in presence or twowituesses' ALBERT L. STEPHENS. THOMAS MCGRATH, Witnesses:

H. H. Nev ns; E. E; Mount. 

